Malicious Office (OOXML) — malware analysis report

Static analysis result for SHA-256 1821631ed3e53615…

MALICIOUS

Office (OOXML)

29.3 KB Created: 2021-06-08 07:44:17 UTC Authoring application: Microsoft Excel 16.0300
MD5: 63d68d0d6f0d10b2f73501498deffb45 SHA-1: 04d9ae82a9b2c21c474994f04576ac17aaed6327 SHA-256: 1821631ed3e53615bb953deffd7e0d1a157bedc8ab192398ca1ea9631d20caa3
302 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro contains a Workbook_Open subroutine that attempts to download a file from 'https://YourWebSite.com/?your_query_parameters' using Microsoft.XMLHTTP and save it as 'C:\test\wp1\file.csv'. It then attempts to execute 'calc.exe' and copies 'cmd.exe' to 'c:\test\wp1\gg1.exe'. The use of Shell() and cmd.exe references indicates an attempt to execute arbitrary code.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC
    VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • cmd.exe reference in VBA high OLE_VBA_CMD
    cmd.exe reference in VBA
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://YourWebSite.com/?your_query_parameters

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
8b41d04e6e1e8d0075eb3c08c202fae21817b75d908b0ddfb2052655cccf01f1		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1894 bytes
vbaProject_00.bin
acb5db9b752cea745a9c25098b7c966eee40ef037aeb3ed3c3208091bb0c2c20		 vba-project OOXML VBA project: xl/vbaProject.bin 19456 bytes

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